Delphi ActiveX GMail: Get a specific message (format="metadata")

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Gets a specific message using format=metadata.

Documentation: https://developers.google.com/gmail/api/v1/reference/users/messages/get

var
rest: TChilkatRest;
success: Integer;
oauth2: TChilkatOAuth2;
sbJson: TChilkatStringBuilder;
json: TChilkatJsonObject;
id: WideString;
threadId: WideString;
snippet: WideString;
historyId: WideString;
internalDate: WideString;
payloadMimeType: WideString;
sizeEstimate: Integer;
i: Integer;
count_i: Integer;
strVal: WideString;
name: WideString;
value: WideString;

begin
rest := TChilkatRest.Create(Self);

//   Provide a previously obtained OAuth2 access token.
oauth2 := TChilkatOAuth2.Create(Self);
oauth2.AccessToken := 'OAUTH2_ACCESS_TOKEN';
rest.SetAuthOAuth2(oauth2.ControlInterface);

success := rest.Connect('www.googleapis.com',443,1,1);
if (success <> 1) then
  begin
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;

rest.AddPathParam('messageId','15fc23688c553739');

rest.AddQueryParam('format','metadata');

sbJson := TChilkatStringBuilder.Create(Self);
success := rest.FullRequestNoBodySb('GET','/gmail/v1/users/me/messages/messageId',sbJson.ControlInterface);
if (success <> 1) then
  begin
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;

if (rest.ResponseStatusCode <> 200) then
  begin
    Memo1.Lines.Add('Received error response code: ' + IntToStr(rest.ResponseStatusCode));
    Memo1.Lines.Add('Response body:');
    Memo1.Lines.Add(sbJson.GetAsString());
    Exit;
  end;

json := TChilkatJsonObject.Create(Self);
json.LoadSb(sbJson.ControlInterface);

//  The following code parses the JSON response.
//  A sample JSON response is shown below the sample code.

id := json.StringOf('id');
threadId := json.StringOf('threadId');
snippet := json.StringOf('snippet');
historyId := json.StringOf('historyId');
internalDate := json.StringOf('internalDate');
payloadMimeType := json.StringOf('payload.mimeType');
sizeEstimate := json.IntOf('sizeEstimate');
i := 0;
count_i := json.SizeOfArray('labelIds');
while i < count_i do
  begin
    json.I := i;
    strVal := json.StringOf('labelIds[i]');
    i := i + 1;
  end;

i := 0;
count_i := json.SizeOfArray('payload.headers');
while i < count_i do
  begin
    json.I := i;
    name := json.StringOf('payload.headers[i].name');
    value := json.StringOf('payload.headers[i].value');
    i := i + 1;
  end;

Memo1.Lines.Add('Example Completed.');

Sample JSON Response Body

{
  "id": "15fc23688c553739",
  "threadId": "15fc23688c553739",
  "labelIds": [
    "IMPORTANT",
    "SENT",
    "INBOX"
  ],
  "snippet": "This is a test. \u200b",
  "historyId": "1438",
  "internalDate": "1510791874000",
  "payload": {
    "mimeType": "multipart/mixed",
    "headers": [
      {
        "name": "MIME-Version",
        "value": "1.0"
      },
      {
        "name": "Received",
        "value": "by 10.25.23.105 with HTTP; Wed, 15 Nov 2017 16:24:34 -0800 (PST)"
      },
      {
        "name": "X-Originating-IP",
        "value": "[2601:249:e00:9093:e894:b27f:e5d6:d01d]"
      },
      {
        "name": "Date",
        "value": "Wed, 15 Nov 2017 18:24:34 -0600"
      },
      {
        "name": "Delivered-To",
        "value": "matt@chilkat.io"
      },
      {
        "name": "Message-ID",
        "value": "\u003cCAPhjyBM1qqXS6NVB65W8Zt5-McF03qWSRDjW5am66wTMuard=w@mail.gmail.com\u003e"
      },
      {
        "name": "Subject",
        "value": "Test HTML email with image and attachment."
      },
      {
        "name": "From",
        "value": "Matt Fausey \u003cmatt@chilkat.io\u003e"
      },
      {
        "name": "To",
        "value": "Matt Fausey \u003cmatt@chilkat.io\u003e"
      },
      {
        "name": "Content-Type",
        "value": "multipart/mixed; boundary=\"001a11401a6c097887055e0ea572\""
      }
    ]
  },
  "sizeEstimate": 11716
}